 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.internal.activities;

 import org.eclipse.ui.activities.ICategoryActivityBinding;
 import org.eclipse.ui.internal.util.Util;

 public final class CategoryActivityBinding implements ICategoryActivityBinding {
     private final static int HASH_FACTOR = 89;

     private final static int HASH_INITIAL = CategoryActivityBinding.class
             .getName().hashCode();

     private String activityId;

     private String categoryId;

     private transient int hashCode = HASH_INITIAL;

     private transient String string;

     public CategoryActivityBinding(String activityId, String categoryId) {
         if (activityId == null || categoryId == null) {
             throw new NullPointerException ();
         }

         this.activityId = activityId;
         this.categoryId = categoryId;
     }

     public int compareTo(Object object) {
         CategoryActivityBinding castedObject = (CategoryActivityBinding) object;
         int compareTo = Util.compare(activityId, castedObject.activityId);

         if (compareTo == 0) {
             compareTo = Util.compare(categoryId, castedObject.categoryId);
         }

         return compareTo;
     }

     public boolean equals(Object object) {
         if (!(object instanceof CategoryActivityBinding)) {
             return false;
         }

         final CategoryActivityBinding castedObject = (CategoryActivityBinding) object;
         if (!Util.equals(activityId, castedObject.activityId)) {
             return false;
         }

         return Util.equals(categoryId, castedObject.categoryId);
     }

     public String getActivityId() {
         return activityId;
     }

     public String getCategoryId() {
         return categoryId;
     }

     public int hashCode() {
         if (hashCode == HASH_INITIAL){
             hashCode = hashCode * HASH_FACTOR + Util.hashCode(activityId);
             hashCode = hashCode * HASH_FACTOR + Util.hashCode(categoryId);
             if (hashCode == HASH_INITIAL) {
                 hashCode++;
             }
         }

         return hashCode;
     }

     public String toString() {
         if (string == null) {
             final StringBuffer stringBuffer = new StringBuffer ();
             stringBuffer.append('[');
             stringBuffer.append(activityId);
             stringBuffer.append(',');
             stringBuffer.append(categoryId);
             stringBuffer.append(']');
             string = stringBuffer.toString();
         }

         return string;
     }
 }

